I've just recapped the 850 PSU for my Amek Big 28. While I was in there, I noticed some resistors attached to the J6 connection. It looks like an add on. It's overheated and the cable, resistors and connection are quite corroded. I'll cut the cable back a bit, and get some new resistors and reconnect but can anyone tell me what these are ? Why have they been added ? Also the colouring on the resistors is gone, so I'm not sure what values they are. Any suggestions ? Images are attached.

Another thing is I measured the voltages coming out of the PSU with the desk attached. It's reading-17.2v+17.7v5.5v 40.9v

Am I good to just trim these up to what they should be with the VR's on the board ? They're all pretty close but that 48v line reading 40.9v seems quite low.